See exactly how much a promotion or pay rise puts in your pocket after tax and NI — and project the long-term cumulative value over your remaining career. Find out what to negotiate for.
| Rise Amount | New Salary | Extra Net /yr | Extra Net /mo | 25yr Value |
|---|
A £5,000 pay rise does not add £5,000 to your take-home pay. After income tax and National Insurance, a basic-rate taxpayer keeps approximately 72% of a rise. A higher-rate taxpayer keeps around 58%. But what people often miss is the long-term compounding value — a £5,000 rise that grows with the salary compounds over a 25-year career into far more than the headline amount.
| Pay Rise | Gross Rise | Net Extra /yr (20% taxpayer) | Net Extra /yr (40% taxpayer) | Extra /mo (20%) |
|---|---|---|---|---|
| 1,000 | £1,000 | £720 | £580 | £60 |
| 2,000 | £2,000 | £1,440 | £1,160 | £120 |
| 5,000 | £5,000 | £3,600 | £2,900 | £300 |
| 10,000 | £10,000 | £7,200 | £5,800 | £600 |
In salary negotiations, employers typically start at or below their maximum offer. If you want a £5,000 rise, ask for £7,000–£8,000. The worst outcome is they say £5,000 — which is what you wanted. The best outcome is they agree to £7,000. Never accept the first verbal offer without at least one counter. Even a £1,000 difference compounds to £35,000+ over a 25-year career after 3% annual growth.
A £5,000 rise for a basic-rate (20%) taxpayer on salary below £50,270: approximately £3,600/year extra net, or £300/month. For a higher-rate (40%) taxpayer: approximately £2,900/year, or £242/month. The effective marginal rate on the rise is approximately 28% for basic-rate taxpayers (20% income tax + 8% NI) and 42% for higher-rate (40% IT + 2% NI). Note that if the rise pushes you from basic to higher rate, the marginal rate applies progressively.
For most UK employees: basic rate (£12,571–£50,270) marginal rate = 20% IT + 8% NI = 28% effective. Higher rate (£50,271–£100,000): 40% IT + 2% NI = 42% effective. Between £100,000–£125,140: 40% IT + Personal Allowance taper creates 60% effective marginal rate. Above £125,140: 45% IT + 2% NI = 47% effective. Pension contributions are the main tool to manage the 60% trap.
Usually yes financially — a 10% rise on a £40,000 salary adds approximately £2,880 net per year, compounding to over £120,000 in cumulative lifetime earnings over 25 years (with 3% annual growth). However, if the promotion significantly increases stress, hours or responsibility without corresponding future progression, non-financial factors become important. Model the financial impact first, then weigh the other factors.